[development] Remove q=node from required modules

[Fred Jones]

> I would like to argue that the required bits of core should not offer
> any paths that display content listings, and that the behavior of q=node
> in the case that no content is published/promoted is particularly
> damaging and should be removed.

I would basically agree--having a switch to turn it off would be VERY
smart for many sites we build also. I have browsed to /node on some
sites just to see what kind of garbage (i.e. not properly themed)
comes up. Many sites have pretty ugly stuff.

Thanks